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Lymanalpha lineIn physics, the Lymanalpha line is a spectral line of hydrogen, or more generally of oneelectron ions, in the Lyman series, emitted when the electron falls from the n = 2 orbital to the n = 1 orbital, where n is the principal quantum number. In hydrogen, its wavelength of 121.6 nanometres, corresponding to a frequency of 2.47 × 10^{15} hertz, places the Lymanalpha line in the far ultraviolet part of the electromagnetic spectrum. Additional recommended knowledgeA Kalpha or K_{α} line analogous to the Lymanalpha line for hydrogen, occur in the highenergy induced emission spectra of all chemical elements, since it results from the same electron transition as in hydrogen. The equation for prediction of the frequency of this line (usually in the Xray range for heavier elements), uses the same basefrequency as Lymanalpha, but modified by a (Z1)² factor to account for differing atomic numbers (Z) between elements, and is expressed as Moseley's law. The Lymanalpha line and the rest of the hydrogen Lyman spectral series are most simply described by the empiric Rydberg equation and semiclassic Bohr model of the atom. See also

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Lymanalpha_line". A list of authors is available in Wikipedia. 